Hide Bathymetry -- The bathymetric points can be toggled by selecting "View/Show-Hide/Bathymetry". Do this twice. Similarly, the coastline can be toggled.

Grid Bathymetry -- Select the "Compute/Depths" to compute the depths in the centers of the grid cells. Then, select the same menu item again to hide the depths.

Saved Grid -- The saved grid will preserve all the features that were current at the time of saving, including the land mask and gridded bathymetry, if any. The "SeaGrid" file is a Mat-file that contains a "struct" with intuitive fieldnames. It is used by the "seagrid2ecom" and "seagrid2scrum" reformatting programs. Both of those are M-files, which can be used as examples for designing other reformatting routines.